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The Alvi brothers say they stopped selling contaminated software sometime in 1987, satisfied that they had taught the software pirates a lesson. Nobody knows precisely how much damage their little experiment caused, but everyone agrees that it was an impressive piece of work. "This virus is elegant," says John McAfee of the InterPath computer company, expressing grudging respect for its creator. "I don't admire what he did, but I admire the way he did it. He may be the best virus designer the world has ever seen."